You can't save a profile that isn't your current settings. Get your settings the way you want, save, then File Save As to your backup profile. Then reopen your main profile and do whatever.
And keep in mind that changes to FLs are applied across all profiles. If you want multiple versions of the same FL, you need to export the FL as hpe (if you want both versions to show in Sentinel, then import the HPE and give the FL a new name).